Separate ParserInterface and Property into their own library

[goodevilgenius]

Those two classes (\Janit\TypeScriptGeneratorBundle\Parser\ParserInterface and \Janit\TypeScriptGeneratorBundle\Parser\Property) could be very useful as a separate library for other projects that want to generate typescript with PHP.

I've already got a project in mind, and I could easily require this entire library as a dependency, but only use those two classes, but it would be more simple if those classes were a separate library that this project would require.